Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Prismatic Polka Dots Mark II No Background
Source GDJ
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Abstract Tiled Background Extended 6
Source GDJ
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ